port forwarding with 2 routers in a row - Network

This is a discussion on port forwarding with 2 routers in a row - Network ; Need help from out there!
Following setup:
I use my Grandstream ATA 486 behind the DSL and connect my netgear
FR114P to the ATA - This Setup was recommended by grandstream to use
my IP-Phone (connected to the ATA) with ...

port forwarding with 2 routers in a row

Need help from out there!

Following setup:

I use my Grandstream ATA 486 behind the DSL and connect my netgear
FR114P to the ATA - This Setup was recommended by grandstream to use
my IP-Phone (connected to the ATA) with the best connection. Guess the
setup is OK.

The only problem i have: how do I setup port forwarding through this 2
routers? I setup the port forwarding on the FR114P and the ATA486 as
described under www.portforward.com but it doesn´t work (as i still
have a low ID on emule). I guess the problem is the ATA 486. The setup
there is as follows:

WAN-Port .... LAN-IP ..... LAN-Port ...... TCP/UDP

I´m not sure if WAN and LAN port are the same and if the LAN-IP should
be the one from the FR114P (192.168.0.1) or the Static Ip from my
computer (192.168.0.11) which i setup for the FR114P.